1．从键盘读入10个整数，然后将它们从小到大排序并写入文件c1.txt，然后再将文件的内容读出来,输出到屏幕上。 2．读取某个路径下的所有文本文件中内容，并将其存储在另一个文本文件中存放。 “D:\\www” File f=new File(“D:\\www”);

1. 代码如下：

import java.io.*;
import java.util.Arrays;

public class SortAndWriteToFile {
    public static void main(String[] args) {
        int[] nums = new int[10];
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        try {
            for (int i = 0; i < 10; i++) {
                nums[i] = Integer.parseInt(reader.readLine());
            }
            Arrays.sort(nums);
            File file = new File("c1.txt");
            FileWriter writer = new FileWriter(file);
            for (int i = 0; i < 10; i++) {
                writer.write(nums[i] + "\n");
            }
            writer.close();
            BufferedReader fileReader = new BufferedReader(new FileReader(file));
            String line;
            while ((line = fileReader.readLine()) != null) {
                System.out.println(line);
            }
            fileReader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

2. 代码如下：

import java.io.*;

public class MergeFiles {
    public static void main(String[] args) {
        File folder = new File("D:\\www");
        File outputFile = new File("output.txt");
        FileWriter writer;
        try {
            writer = new FileWriter(outputFile);
            for (File file : folder.listFiles()) {
                if (file.isFile() && file.getName().endsWith(".txt")) {
                    BufferedReader reader = new BufferedReader(new FileReader(file));
                    String line;
                    while ((line = reader.readLine()) != null) {
                        writer.write(line + "\n");
                    }
                    reader.close();
                }
            }
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}